I think it would be a simplification to the POWDER design to merge
includePorts and includePortRanges so that
<wdr:includePorts>80 81 87 100-103 105-106</wdr:includePorts>
would identify the following ports
80, 81, 87, 100, 101, 102, 103, 105, 106.
It may also be worthwhile (whether or not you accept the merge
suggestion), to clarify that no whitespace is permitted in a range like
100-103
Jeremy